<!DOCTYPE html>
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<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <span id="aa">我是id选择器</span>
    <span class="bb">我是class选择器</span>
</body>
</html>